JPH0982057A - Magnetic disk apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To fix a liner to a shell without a fusion and improve the cleaning effect, by fixing the liner with a liner retainer fixed to the inner faces of an upper and a lower shells. SOLUTION: A liner retainer 10 comprises a retainer part 10a for retaining the outer periphery of a magnetic disk 3 and a fixing part 10b for fixing the liner retainer 10 to shells 2a, 2b. A step difference part 10c is formed on the lower face of the retainer part 10a. While the liner retainer 10 is disposed at a predetermined position of the shells 2a, 2b, and at the same time, liners 4a, 4b are brought to a predetermined position, the outer periphery and inner periphery of the liner 4a, 4b are positioned below the liner retainer 10 and the fixing part 10b of the liner retainer 10 is fused to the inner faces of the shells by ultrasonic waves. The magnetic disk 3 is held between the liners 4a and 4n. Then, an erroneous erasure plug 8 is set at a predetermined position and the upper and lower shells 2a, 2b are overlapped and fused. A shutter 9 is integrated. The magnetic disk apparatus is completed in this manner.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic disk device, and more particularly, to improvement of a structure for attaching a liner sheet to a shell for housing a magnetic disk.

[0002]

2. Description of the Related Art Conventionally, in a magnetic disk device such as a floppy disk, as shown in FIGS.
The magnetic disk 3 is rotatably housed between the upper shell 2a and the lower shell 2b. Both sides of the magnetic disk 3 are sandwiched by liner sheets (hereinafter referred to as liners) 4a and 4b made of non-woven fabric to clean the magnetic disk 3 and rotate the magnetic disk 3 smoothly so as not to scratch it.

The liners 4a and 4b are generally welded to the inner surfaces of the shells 2a and 2b by heat or ultrasonic waves. However, a disadvantage of this welding structure is that the molten residue of the liner or shell from the welded portion (welding portion 4c) causes fluffing or burrs to interfere with the cleaning effect of the liner.

At the same time, since the liner is welded to the shells 2a, 2b, if there is a deviation in the adhesion, the correction cannot be corrected and all the failed ones must be discarded.
Also, for recycling, since the liner and the shell made of different materials are integrated, they cannot be easily disassembled. Although there are various conventional methods for welding the liner 4 and the shapes of the welding patterns, all of the methods of welding the liner itself are common, and are not means for solving the above-mentioned problems.

The magnetic disk device 1 is provided with a metal hub 5 fixed to the center hole of the magnetic disk 3, and the hub 5 is rotationally driven by a driving device. Further, the upper shell 2a and the lower shell 2b are provided with recording / reproducing windows 6a and 6b which face the upper and lower surfaces of the magnetic disk 3, and a magnetic head is inserted into the recording / reproducing windows 6a and 6b from the outside to record a signal on the magnetic disk 3. It is designed to play.

One end of the leaf spring 7 is ultrasonically welded to the inner surface of the lower shell 2b, so that the liners 4a and 4b and the magnetic disk 3 are appropriately pressed against the inner surface of the upper shell 2a. An erroneous erasure prevention plug 8 is provided at a corner in a space surrounded by the upper and lower shells 2a and 2b. Further, a shutter 9 for opening and closing the recording / reproducing windows 6a, 6b is provided so as to straddle the upper shell 2a and the lower shell 2b.

[0007]

SUMMARY OF THE INVENTION Therefore, the object of the present invention is to improve the structure of such a magnetic disk device, fix the liner to the shell without welding, have a good cleaning effect, and can easily recycle the magnetic disk device. Is to provide.

[0008]

In order to solve the above problems, the magnetic disk device according to the invention of claim 1 is constructed such that the liner is fixed to the inner surfaces of the upper and lower shells by fixing the liner, and the liner is fixed by the liner. To prevent liner fuzz and burrs from occurring.

According to a second aspect of the present invention, there is provided a magnetic disk device according to claim 1, wherein the liner retainer comprises a retainer portion and a fixing portion.
The liner is fixed between the holding section and the inner surface of the shell to prevent the liner from fluffing and burrs.

The magnetic disk device according to a third aspect of the present invention is characterized in that the pressing part of the liner pressing part has a step part between the liner pressing part and the shell, and has an uneven part. And the liner is pressed between the step and the shell.

A magnetic disk device according to a fourth aspect of the present invention is the magnetic disk device according to the first aspect, wherein the fixing portion of the liner retainer is provided with a rib for welding on a surface facing the shell. The ribs are melted during ultrasonic welding and welded to the shell.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION The structure and operation of the magnetic disk device of the present invention will be described below with reference to FIGS. FIG. 1 is a plan view of a magnetic disk device of the present invention, where (a) is an upper shell and (b) is a lower shell.
2A and 2B are plan views of the liner retainer used in the magnetic disk device of the present invention. FIG. 2A is for the upper shell and FIG. 2B is for the lower shell. FIG. 3 shows a magnetic disk device of the present invention,
(A) is a partially cutaway view thereof, and (b) is A of FIG.
-A sectional view, (c) is a BB sectional view.

The liner retainer 10 has a retainer portion 10a and a liner retainer 1 for retaining the outer periphery of the magnetic disk 3.
0 is fixed to the shells 2a and 2b by a fixing portion 10b, and a step portion 10c is provided on the lower surface of the pressing portion 10a to serve as a positioning for the liners 4a and 4b, and the concave and convex portions are formed on the lower portion. The uneven surface 10d is used to secure the frictional engagement force between the liners 4a and 4b.

A rib 10e for welding is provided on the lower surface of the fixed portion 10b. This welding rib 10e is
It may be provided on the shell 2a, 2b side. Liner foot 10
Except for the portion where the leaf spring 7 is arranged, the magnetic disk 3 is composed of substantially the entire circumference of the outer peripheral portion 10f and the inner peripheral portion 10g and the recording / reproducing window portion 10h. 2A shows the liner retainer fixed to the upper shell side, while FIG. 2B shows the liner retainer fixed to the lower shell side. It is configured such that they overlap each other, and when the portion where the leaf spring 7 is located is also overlapped, the same portion is omitted.

The liner retainer 10 is formed by an ordinary injection molding method, and the material thereof is preferably ABS resin having good moldability. If the same material as the shell is used, recycling can be facilitated. If the liner retainer is connected by a molding runner so that the liner retainer does not become disjointed after molding, the assembly becomes easy.

[0016] The liner retainer 1 thus constructed
0 is placed at a predetermined position of the shells 2a, 2b, and at the same time, the liners 4a, 4b are brought to a predetermined position so that the outer and inner circumferences of the liners 4a, 4b are located below the liner retainer 10. The fixing portion 10b of the presser foot 10 is ultrasonically welded to the inner surface of the shell. Next, the magnetic disk 3 is sandwiched between the liners 4a and 4b, the erroneous erasing plug 8 is placed at a predetermined position, the upper and lower shells 2a and 2b are overlapped and welded, and the shutter 9 is assembled to complete the magnetic disk device. .

In the magnetic disk device constructed as described above, since the peripheral portion of the liner is held down by the liner retainer and concealed, the occurrence of fluff and burrs on the liner is eliminated, and the liner retainer presses the liner. Since the liner is broken, the liner can be easily separated from the shell if the liner is destroyed, and the material can be easily recycled. In addition, the liner retainer plays a role in determining the position of the liner at the time of assembly, eliminates the positional deviation of the liner, and eliminates the risk of accidentally jumping out of the shell. In the embodiment of the present invention, the liner 4
Although ultrasonic welding was used for a and 4b, double-sided adhesive tape may be used instead of ultrasonic welding, or hot-melt adhesive may be used for adhesion.

[0018]

As is apparent from the above description, according to the magnetic disk device of the present invention, the occurrence of fuzz and burrs from the fixed portion of the liner can be improved and reliability can be improved. Further, the shell and the liner can be easily separated, which facilitates recycling.

[Brief description of drawings]

FIG. 1 is a plan view of a magnetic disk device of the present invention,
(A) is an upper shell, (b) is a lower shell.

FIG. 2 is a plan view of a liner retainer used in the magnetic disk device of the present invention, where (a) is for an upper shell and (b) is for a lower shell.

3A and 3B show a magnetic disk device of the present invention, FIG. 3A is a partially cutaway view thereof, FIG. 3B is a sectional view taken along the line AA of FIG. 1, and FIG. Is.

FIG. 4 is an exploded view of a conventional magnetic disk device.

5A and 5B show a conventional magnetic disk device, wherein FIG. 5A is a plan view of an upper shell, and FIG. 5B is a plan view of a lower shell.

[Explanation of symbols]

 1 magnetic disk device 2a upper shell 2b lower shell 3 magnetic disk 4a liner (upper) 4b liner (lower) 4c welding part 5 hubs 6a, 6b recording / reproducing window 7 leaf spring 8 erroneous erasure prevention plug 9 shutter 10a holding part 10b fixing part 10c Step portion 10d Uneven surface 10e Welding rib 10f Outer peripheral portion 10g Inner peripheral portion 10h Recording / reproducing window portion

Claims (4)

[Claims] 1. A magnetic disk drive in which the liner is fixed by a liner retainer fixed to the inner surfaces of the upper and lower shells. 2. The magnetic disk drive according to claim 1, wherein the liner retainer comprises a retainer portion and a fixing portion. 3. The magnetic disk drive according to claim 1, wherein the presser portion of the liner retainer has a step portion and an uneven portion between the retainer portion and the shell. 4. The magnetic disk drive according to claim 4, wherein the fixing portion of the liner retainer has a welding rib on a surface facing the shell.